Not a bad idea, Tom, although it has been brought up before in a slightly less 'organised' fashion.
Some problems spring to my mind.
I use all my membership allocation for GA tickets so would not benefit in any way. However, I am sure that a deal could be struck with the ACO for a bulk purchase - I'm sure Messrs MRI, Just Tickets etc don't pay Series A rate for what they purchase.
Also consider the liability. CA, or you, would be liable for the payment of all tickets ordered, and as we all know, circumstances change in the 12+ months between ordering and attending, and there will undoubtedly be 'non-payers'.
CA, or you, would also come in for stick if (when) some people could not get what they asked for, and could well result in, again, non-payment.
It would be 'infradig' for those lucky people on the 'magic' list to be demoted back to the ranks

I think this is something that may be worth developing, but we should 'evolve' into it rather than rush into things. Termie's offer for 2008 orders is a good starting point - we should monitor the numbers and feedback later to determine if it is worth developing.
Del